Output MPEG-TS stream identifiers.

with changes by michael to simplify API

libavformat/avformat.h

@@ -606,6 +606,13 @@ typedef struct AVStream {
      */
     int codec_info_nb_frames;
 
+    /**
+     * Stream Identifier
+     * This is the MPEG-TS stream identifier +1
+     * 0 means unknown
+     */
+    int stream_identifier;
+
     /**
      * Stream informations used internally by av_find_stream_info()
      */